"Nearly three-quarters of Americans say global warming influences U.S. weather and made this year's record-hot summer worse, a survey said on Tuesday."

"Conducted by Yale and George Mason universities, the survey found 74 percent of Americans believe that global warming is affecting weather, up 5 percentage points since March 2012, the last time the two organizations asked these questions.

Seventy-three percent of Americans said global warming made the record-high temperatures of summer 2012 worse, and 61 percent said weather in the United States has been worsening over the past several years, an increase of 9 percentage points since March."